Sedimentary Law Of Coal Seam Roof Aquifer And Risk Assessment Of Surge(Outburst)Water In Yuandatan Mine Field

The hydrogeological conditions of the Jurassic coalfield in the Wangheng mining area are relatively complex,and hydrogeological research is weak.The Yuandatan coal mine is located in the eastern part of the Yebian Mine area.There is only one production shaft near the Xiaojihan coal mine.As the mine is about to be put into production,it will face numerous hydrogeological problems.Therefore,it is necessary to study the hydrogeological conditions before mining.Investigate the law of sedimentation and water accumulation in the aquifer of the coal seam roof,and evaluate the risk of water flooding in the mine under mining conditions,so that the mine can develop targeted control measures against different hazard levels of water hazards.The paper starts from the regional sedimentary geological background and sedimentology,and uses the comprehensive marker layer,logging electrical characteristics and lithology characteristics,and based on the porous division and comparison,according to the sedimentary cycle stratigraphic control method under the control of the marker layer,Yuan Da The Yan’an formation of the Jurassic strata in the Tanjing area is divided into five sections,and the Zhiluo formation is divided into two sections.The stratigraphic framework of the Yanan and Zhiluo formations in the Jurassic Yandatianjing Formation was established.The analysis method of the sequence stratigraphy analyzed the types of sedimentary facies and the distribution characteristics of sand bodies in different intervals,revealed the formation environment and temporal and spatial distribution rules of the aquifer and aquicludes in the well fields,and provided geology for the study of the water richness of the mine roof aquifer.basis.By studying the information related to the water-richness of aquifers in geological and hydrogeological prospecting data,based on the water-rich index method,the sandstone thickness,sand-mud combination characteristics,brittle-plastic rock thickness ratio,unit water inflow,and permeability coefficient were selected.There are 8 factors,including the core rate,the 2 coal water content,and the structure of the fold axis,as indicators of information fusion in water-rich zones.Using the GIS multivariate information fusion method,on the basis of the study of sedimentary law,we obtained the water-rich zone of the aquifer.It is concluded that the water-richness of minefield gradually decreases from northwest to southeast,and the comparison with geophysical results shows that the relatively rich water-dividing areas are basically consistent.Using numerical analysis,similar materials and other methods and methods,scientifically and effectively predicted the failure law of overlying strata in coal seam mining,and combined with the measured data of nearby mines,a comprehensive study found that the coal seam splitting ratio of 28 is 28 times.The elevation analysis of the height of the water-guiding fissure zone and the floor elevation of the coal seam from the aquifer indicate that,under the conditions of coal seam mining,the water-conducting fissure zone mainly consists of the Yanan and Zhiluo aquifers.Comprehensive utilization of the results of the aquifer’s water-rich section map and the development map of the water-guiding fissure zone,the classical "three maps" method was used to apply the GIS multi-information superposition and fusion technology to predict the risk of flooding in mines.The research results have important reference value for prevention and control of mine water disasters and reasonable development and utilization of water resources in mining areas.